We encourage you to contact us with
suggestions for the beams you require to pursue your physics research.
Parameters
as to what constitutes a suitable beam for the HRIBF
may be found in our more recent newsletters.

We ask that you need to be aware that scheduling experiments at our
facility is difficult. In some cases such as transfer experiments, suitable
equipment is not yet in place to take full advantage of the allocated
beam time. In other cases, sufficiently many experiments must be available
before it is "cost effective" to schedule a particular RIB ion source
or endstation configuration.

We are requesting letters of intent be submitted for beams of
68Ge which has a halflife of 270.8 days.
A sputter ion source (as with 7Be)
can be used for this isotope which can be purchased commercially.
Some material preparation will be necessary prior to insertion into the
source but we believe this is manageable.
The anticipated accelerated beam intensity on target is on the order of
low-107 i/s.

Beams of 25Al (7.18 s halflife)
and the metastable state of
26Al (6.4 s halflife)
should be possible at accelerated beam intensities on target of
low-104 i/s. Note that due to
the long halflife of 7.2 x 105 y, we do not
know what the ground state component of the A=26 beam will be.
Development work on this beam has been carried out with tandem beams and
extracting AlF+ ions. Since these molecules have also been used to transport
our Fluorine beams, we are confident we know how to handle these beams.
Things yet to do are high-current tests with ORIC and to try new
target material which has a higher density of Si. The above intensity assumes
the already-tested material and 5 uA of ORIC beam.

Neutron-rich RIB Development - An update

ORIC is now able to deliver 54 MeV proton beams to the uranium carbide
targets. This increase in energy is expected to increase yields in
all neutron-rich species by at least a factor of 50%. Recently, 6 uA
of ORIC beam at 54 MeV has been shown to have the same yield for
selected isotopes as 10 uA of 42 MeV beam.
For more information contact Carl Gross at
liaison@phy.ornl.gov.

Proton-rich RIB Development - An update

Other proton-rich beams are in various stages of development. We
anticipate being able to deliver approximately
1x103 i/s/uA on target of
27Si, and
4x103 i/s/uA on target of
34Cl. It should be noted that
these beams have not been accelerated through the tandem and we
are assuming 10% transmission to the target. We do not know how
many microamps these targets can withstand. More development work
is planned. The Cl work has been done with natural abundance of
34S (4.2%) in the target. Higher
yields are possible if enriched material can be used to form
CeS targets.
For more information contact Dan Stracener at
stracener@phy.ornl.gov.

Small CsI detector array

Elements of the 5-ring CsI array have been tested at the RMS target area.
This detector is used without absorbers for improved response with heavy
nuclei. The entire array should be operational before the PAC-10 deadline
for proposals.
For more information contact Alfredo Galindo-Uribarri at
uribarri@phy.ornl.gov.

Neutron detector array

A 19-element neutron detector array has been installed and tested with
beam at the target of the RMS. We estimate that the array will have an
efficiency between 11% to 18% depending on the reaction. When used with
the RMS, the central detector must be removed.
For more information contact Chang-Hong Yu at
chy@phy.ornl.gov.

Microchannel plates at final focus of the RMS

The large MCP detector has worked well in several experiments. An
additional smaller MCP has been used with the larger one during
proton emission measurements.
For more information contact Carl Gross at
cgross@phy.ornl.gov.

Data acquisition

We have moved to LINUX machines for our data acquisition
computers. These replace DEC Alpha machines.
In the new system, data is written directly to disk on a
new 2-terabyte server. For transport to the user's home, we
offer DVD writers (-R,-RW formats) which hold roughly 4.3 GB of data
or the usual Exabyte tapedrives. Users are expected to bring their
own DVDs and tapes. Tapes will be slowly phased out.
For more information contact Robert Varner at
varner@phy.ornl.gov.

Recoil mass spectrometer and online test facility

No beams will be delivered to the RMS and OLTF during the period
of June through September 2004. The new construction for the
High Power Target Laboratory will prevent the delivery of beams
to these endstations. During this period we plan on running
17,18F and 7Be
to the other experimental areas.
For more information contact Carl Gross at
cgross@phy.ornl.gov.